I would DEFINITELY recommend Cosspace, I've made a lot of good friends from other countries because of that site.

Last year I even went to Rome to visit my friend Valeria who I know because of Cosspace, and it's also where I started talking to Yaya Han, who is now coming to perform at our ball (www.grandcosplayball.com)

It's also an easy way to keep in touch with cosplayers specifically. It's just a shame I haven't had time to use it recently...

I mainly use it as a photodump, since you can only put up six pictures per costume here and I don't want to overfill my cosplay.com account. I've never been keen on Myspace for various reasons so my Cosspace very much takes a back seat to my LJ and other cosplay profiles, but I like having it.